Storm water overflow tank "Obere Aue", Essen-Heisingen
In order to create the infrastructure necessary for housing development plans in the Essen suburb of Heisingen, local rainwater treatment had to be rehabilitated. On the site of the sewage treatment plant Essen-Heisingen dating from 1957, the storm water overflow tank “Obere Aue” (Upper Meadow) was built, featuring a capacity of 1,400 cubic metres, a combined sewage and storm water pumping station, and around 425 metres of inlet and outlet canals with diameters of up to 2.20 metres, installed up to 9 metres underground. The capital commitment was around 4.5 million Euros.
As a result of this project, six municipal storm water overflows could be closed, considerably reducing emissions. The combined water is now pumped directly to the sewage treatment plant of Essen-Kupferdreh (laid out for 96,000 inhabitants) via the storm water overflow. The old sewage treatment plant of Essen-Heisingen which had only been used for mechanical pre-treatment was dismantled.